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8b+28=-4+4b+12
We move all terms to the left:
8b+28-(-4+4b+12)=0
We add all the numbers together, and all the variables
8b-(4b+8)+28=0
We get rid of parentheses
8b-4b-8+28=0
We add all the numbers together, and all the variables
4b+20=0
We move all terms containing b to the left, all other terms to the right
4b=-20
b=-20/4
b=-5
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